PACCAR Inc. TX-8 — Transmission Manual Override

INDICATIONS AND CONTROLS - Gearshift Lever Pushing or pulling the lever will briefly upshift or downshift the transmission gear respectively (about four seconds); after which, the transmission will return to the ideal gearing for the current vehicle speed and engine use. Pushing and holding the lever away will engage the LOW Mode (see LOW Mode Operation). When in Manual mode Pulling the lever towards the driver will upshift ( + ). Pushing the lever away will downshift ( ). Pushing and holding the lever away will engage the LOW Mode (see LOW Mode Operation). The selected gear will appear beside the transmission mode on the Transmission Gear Display (see Transmission Gear Display on page 17 ).

Manual and Automatic Mode Manual Mode Use Manual mode when driving conditions make it preferable to select a particular gear instead of allowing the transmission to select it automatically. The operator manually selects the start gear and uses the up/downshift request to change gears. The system will hold the current gear until another upshift or downshift request is made, except when the conditions for a Transmission Manual Override occur (see Transmission Manual Override ). 3 NOTE Pressing this button places the transmission in Manual mode. Manual mode allows the operator to select the gear (See Upshifting and Downshifting on page 18 ).

To activate, put the gear selector in the D (drive) mode and then depress the Manual Mode Button. When Manual mode is selected, M is shown in the Transmission Gear Display (See Transmission Gear Display on page 17). Multiple upshift or downshift requests may be allowed when the up/downshift request procedure is performed multi- ple times in succession. Each push or pull of the gear shift lever equals one gear change request. For optimal vehicle performance, it is recommended the vehicle be operated in Automatic mode. Transmission Manual Override If the vehicle is being back-driven and the engine is approaching a higher than acceptable engine operation range, the Y53-1331 (6/21) 19